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Building Materials - Section 5 :: Discussion
| 11. | When a brick is immersed in water for 24 hours and then dried, if | |
| A. | no grey or white deposits appear on the surface, the brick is free from soluble salts | |
| B. | 10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence | |
| C. | 50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence | |
| D. | All the above. | |
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